Abstract
The rates of oxygen consumption under conditions of feeding and starvation and the rates of ammonia excretion after feeding increased with each larval stage of the American lobster (Homarus americanus Milne Edwards) and decreased with the first postlarval stage. There was no significant difference in the O:N ratio of the first three larval stages (~26.5), but a significant reduction (P < 0.01) was measured among stages IV and V. It appears that, whereas protein catabolism may be the principal source of energy, some of the energy yield during larval development is from lipid or carbohydrate catabolism; the use of the latter substrates is diminished in the last larval and first postlarval stages.
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